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Commercially Pure Zirconium vs. R30816 Cobalt

Commercially pure zirconium belongs to the otherwise unclassified metals classification, while R30816 cobalt belongs to the cobalt alloys. There are 21 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is commercially pure zirconium and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 98
210
Elongation at Break, % 18
23
Fatigue Strength, MPa 60
250
Poisson's Ratio 0.34
0.3
Shear Modulus, GPa 36
81
Tensile Strength: Ultimate (UTS), MPa 430
1020
Tensile Strength: Yield (Proof), MPa 240
460

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Specific Heat Capacity, J/kg-K 270
420
Thermal Conductivity, W/m-K 22
13
Thermal Expansion, µm/m-K 5.5
12

Otherwise Unclassified Properties

Density, g/cm3 6.7
9.1
Embodied Water, L/kg 450
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 65
190
Resilience: Unit (Modulus of Resilience), kJ/m3 290
510
Stiffness to Weight: Axial, points 8.1
13
Stiffness to Weight: Bending, points 23
22
Strength to Weight: Axial, points 18
31
Strength to Weight: Bending, points 19
25
Thermal Diffusivity, mm2/s 12
3.3
Thermal Shock Resistance, points 56
28

Alloy Composition

Carbon (C), % 0 to 0.050
0.32 to 0.42
Chromium (Cr), % 0 to 0.2
19 to 21
Cobalt (Co), % 0
40 to 49.8
Hafnium (Hf), % 0 to 4.5
0
Hydrogen (H), % 0 to 0.0050
0
Iron (Fe), % 0 to 0.2
0 to 5.0
Manganese (Mn), % 0
1.0 to 2.0
Molybdenum (Mo), % 0
3.5 to 4.5
Nickel (Ni), % 0
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Nitrogen (N), % 0 to 0.025
0
Oxygen (O), % 0 to 0.16
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Tungsten (W), % 0
3.5 to 4.5
Zirconium (Zr), % 94.7 to 100
0